Telephone system



Nov. 114 1 NEILL TELEPHONE SYSTEM H. W.O

hue/71 6K- Wen/3y WO/Vev/l 2 Sheets-Sheet 1 Filed Dec.

H. W. ONEILL TELEPHONE SYSTEM Nov. 11 1924.

2 Sheets-Shet 2 Filed Dec. 9, 1922 v MNN 9 a i i 7 w SN .mwNmbm-mPatented Nov. 11, 1924.

stares HENRY W. ONEILIJ, OF BROOKLYN, NEW YORK, ASSIGNOR TO "WESTERNELECTRIC COMPANY, INCORPORATED, 073 NEW YORK, N. Y., A. GORYORATIO'N OFNEW YORK.

TELEPHONE SYSTEIII.

Application filed December 9, 1922. Serial No. 605,793.

To aZZ whom it may concern:

Be it known that I, HENRY W. Ollnrnri, a citizen of the United States,residing at Brookl n, in the county of Kings, State of? New ork, haveinvented certain new and useful Improvements in Telephone Systems, ofwhich the following is a full, clear, concise, and exact description.

This invention relates to telephone systems and particularly to circuitsemployed in building up toll connections.

An object of this invention is to control a signal over a line circuitby the trans"- mission of alternating currents over the line,alternating current of one character being automatically applied to theline when a cord circuit is connected to the line, and alternatingcurrent of another; character being automatically applied to thelinewhen the cord circuit is disconnected from the line.

Another object of the invention is to opcrate the signaling means ateach end of a circuit in response to interruptions or the circuit ateither end to apply alternating current to the circuit to actuate asignal at the distant end.

A feature of the invention resides in a plurality of cooperating relayswhich when operated to record a signal of one nature are reset by theoperation of a manual switch to record a signal of another nature.

The invention will be readily understood from the following detaileddescription and by reference to the accompanying drawings in which Fig.1 shows a subscribers line and equipment T of a toll line L terminatingat an inward or switching operators position C. Fig. 2 shows theequipment for the distant end of the toll line L terminating at anoutward toll operators position B together with such portions of a cordcir cuit K as are required for use with the toll line L.

It will be understood that in practice there may be a plurality of tolllines such. as L extending between the distant oflices for which acommon order wire circuit (not shown) will be provided, wherebytheoutward operator at position B may request that connections beestablished by the open a-tor at position 0. It will also be understoodthat the operator at position B may have a plurality of cord circuitssuch as it at her position. Y

Eissun'iing the operator at position 13 desires to establish aconnection with the station A, she makes this request over an order wirecircuit (not shown). The inward operator at position C may assign thetoll line L and thereupon insert a plug 112 in jack 113 of the line atstation A, while the outward toll operator at position I?) may insertplug 200 ot the cord circuit K into jack 201. 0

Upon the insertion of plug 200 into jacl; 201, circuit is establishedwhich may be traced from grounded battery, circuit con trolling elements202 and 203 associated with the acceleration type relays 20a and 205,respectively, normal contact of key 206. conductor 20?, left-handarmature and back contact of relay 208, conductor 209, normal breakcontacts o1 relay 210, conductor 211, right-hand normal break contactsof relay 212, conductor 213, winding of relay 214's conductor 215, lamp216, sleeve contacts of plug 200 and jack 201, conductor 217 and thenceto groundthrough the winding of relay 218. It the plug 200 is insertedin jack 201 previous to the seizing of the line A. by the operator atposition O, lamp 216 lights in this circuit. It will appear later on inthe description that as soon as plug 112 is inserted in jack 113, lamp216 will be extinguished. Relay 218 in operating,'connects the1000-cycle current source 219 to the line conductors 220 and 221whereupon current from this source flows out over the line. Belay A18,in attracting its lowermostarmature establishes an energizing circuitfor relay 222, which may be traced from grounded battery, lowermostarmature and front contact of relay 218, conductor 223 to ground throughthe winding of relay 222.

Relay 222 operates and disconnects the 1000 cycle current source 219from the line conductors and connects the toll line conductors throughto the tip and ring of jack 201. Relay in operating also, establishes anenergizing circuit for relay 224i extending from grounded battery,lowermost armature and front contact of relay 222, conductor and thenceto ground through the winding of relay 224. Relay 22 1, in operating,

does not aliect the operation oi" the circuit in any way at this time asthe conductors 226 and 227 leading from the 1500 cycle current source228 are open at the back contacts of relay 218.

The current pulse from the 1000 cycle source 219, when applied to thetoll line as previously mentioned, traverses a path ex tending fromsource 219, back contact and lower inner armature of relay 222, frontcontact and lower inner armature of relay 218, line conductor 221, lowerarmature and back contacts of relays 100 and-101, conductor 102,windings of the acceleration type relays 103, 104 and 105, conductor106, back contact and upper armature of relay 100, line conductor 220,upper armature and front contact of relay 218 and back to the source219-over the upper armature and back contact of relay 222.

r The relays 103, 104 and 105 are respectively responsive to currents of5.00, 1000 and 1500 cycle frequencies so that relay 104 is the onlyrelaywhich operates in the circuit just traced. Relay 104 in operating,interrupts the normal energizing circuit for relay 107 which maybetraced from grounded battery, circuit controlling element 108 associatedwith relay 104, conductor 109, winding of relay 107, and thence toground 1 through the front contact and armature of said relay 107. Belay107 thereupon releases and prevents the illumination of lamp 110 at thistime, assuming that the operator 7 at position Chas seized the line A,

At the instant the plug 112 was inserted into the jack 113, a circuitwas established extending from grounded battery, winding of relay 114,winding of relay 111, sleeve contacts of plug 112 and jack 113, andthence to ground through the winding of cut-01f relay 115. Relay 115operates and disconnects the line relay 116 from the subscribers line A.Relay 111, in attracting its right-hand armature places a momentaryground on conductor 117 to effect the momentary operation of relay 10.0.over an obvious circuit. The momentary ground placed on conductor 117 issuflicient to ini tially energize relay 123 over a circuit extendingfrom grounded battery, circuit con trolling element 121 of relay 103,conductor 122, upper winding of relay 123, normal break contacts ofrelay 123, conductor 124 to ground on conductor 117. Relay in itsmomentary operation, connects the 500 cycle and 1500 cycle currentsources 118 and 119 to the line conductors 22 0 and 221 whereupon acurrent pulse from the sources 118 n 19 fl w out Ov r he r nt on ac andlower armature of-relay 100, line con; ductor'221, lower inner armatureand front contact of relay 218, lower inner armature nd ir Con f. r l y22, r ng con a t of jack 201 and plug 200, lower normal contacts ofringing key 229, conductor 230, windings of relays 204 and 205,conductor 231, upper normal contacts of key 229, tip

contacts of plug 200 and jack 201, frontcontact and innermost armatureofrelay 22.2,

conductor 211, normal contacts fr m co t t an ppe mos arm t of relay218, line conductor 220, upper armature and front contact of relay 100and thence back to the current sources 119 and 118.

At the time that plug 200 was inserted in jack 201, relay 214 operatedover the circuit previously traced. Relay 214, in operating, prepares acircuit for relay 210.

Relays 204 and 205 are responsive to 500 and 1500 cycle currents,respectively, from the sources 118 and 119, and upon the operation ofrelay 100, these relays energize,

and at their controlling elements 202 and 203 remove battery 233, whichheretofore shunted out relay 210. Upon the removal of this shunt, relay210 operates over a circuit extending from grounded battery 232,lefthand normal break contacts of relay 212, winding of relay 210,armature and front contact of relay 214, winding of relay 214, conductor215, lamp 216, sleeve contacts of plug 200 and jack 201, conductor 2 17to ground through the winding of relay 218'.

At the cessation of the impulse of double frequency currents, relays 204and 205 restore and current from battery 233 then flows out over a pathextending from grounded battery 233, circuit controlling elements 202and 203, normal contacts of key 206, conductor 207, armature and backcontact of relay 208, conductor .209, front contact and armature ofrelay 210, conductor 234, winding of relay 212, sleeve contacts of plug200 and jack 201, conductor 217 to ground through the winding of relay218. Relay 212 operates in this circuit and removes battery 232 from thewindings of relays 210 and 214 whereupon these relays are deenergizedand lamp 216 extinguished. Relay 212, in operating locks over a pathincluding its right-hand alternate contacts, of relay 210 and the pathpreviously traced to battery It will be noted that the contacts of relay212 are of the make-before-break type, thereby insuring continuity ofcircuit during the operation of this relay.

The operator at position B on not'ng the darkening of lamp 216, realizesthat the line A of the called party has been seized and she proceeds to,ring the subscriber. In signaling'the called subscriber, the operatoractuates key 229 and in so doing, a circuit is I established extendingfrom cne side of the 500 cycle current source 240, lower contacts of key229, ring contacts of plug 200 and jack 201, front contacts and middlearmatures of relays 222 and 218, line conductor 100, line conductor 220,uppermost armaur s n t out contacts oi ay 218 n 222, tip contacts ofjack 201 and plug 200, upper alternate contacts of key 229 and back tothe source 240.

The operation of key 229 also completes a circuit extending fromgrounded battery, conductor 250, lowermost contacts of key 2. .9,conductor 251, Winding of relay 208, sleeve contacts of plug 200flandjack 201, conductor 21.7 to ground through the Winding of relay 218.Relay 208 energizes in this circuit and at its left-hand armatureinterrupts the energizing circuit for relay 212 which in turn,reestablishes the original energizing circuit for relay 21 1- and lamp216 with the exception that from conductor 207, the circuit passes overthe armature and front contact of relay 208 instead of the armature andback contact as in the first case. At its right-hand armature, relay 208establishes an obvious locking circuit for itself. Lamp 216 thereuponrelights upon the actua io ofk y22 Relay 103 being the only relay inthecircuit preyiouslytraced including relays 103,

10.4: and105 ,that isresponsive to 500 cycle current, operates and atits circuit controlling element 121 interrupts the ener circuit forrelay 123. Relay 123, in retracting its armature connects the ringingcurrent source 125 to the ring conductor of the line and ground to thetip conductor so that current from source 125 traverses an obvious pathover the subscribers line loop. to operate the bell at station A. i V

In response to this signal, thesubscriher on line A removes the receiverfrom the switchhook thereby causing an increase of current through thelower winding ofrelay 123, which causes this relay to again energize andreestablish its locking circuit which extends from grounded battery,circuit controlling element 121, conductor 122, upper Winding of relay 123, front contact and middle armature of relay 123 to ground over thefront contact and armature of relay 111. A circuit is thereuponestablished, which may be traced from grounded battery, winding of relay12,7, resistance element 128, lower leftrhand winding of repeating coil129, front contact and lowermost armature of relay 123, lower armatureand front contactv of relay .1 s ring c nta f Pl g 112 andipack 113,.line 1 19p an ppa a s at station A, tip contacts of jack 113 and plug112, front contact, andupperarmature of re y 11%,. uppermost. armature.and front co act otr lay 1.2.131, PP-22 2121 1 in ing repeatingcoil 129to ground through re istance lement 1 0 lillr lZ BHe 's in thiscircuitandestablishes a circuit for relay 1 01extending from grounded battery,fro t o tact a d a ma r r re ay 2 conductor 131 to ground throughthe'windns. cfrelay 101.- Bel y 1.017 in opera g,

relays 222 and 2241 to release.

at its lowermost contacts disconnects the relays 108, 101 and 105 fromthe line circuit and extends conductor 221 to the line side of therepeating coil 129, and at its upper contacts places a momentary groundon conductor 132 which momentarily completes an obvious circuit forrelay 100.

Relay in energizing, in a previously described instance, effects theenergization of relays 204: and 205 from the 500 and 1500 cycle currentsources 118 and 119. As hereinbefore described, the operation of relays2041 and 205 again causes the operation of relays 210 and 212 and thedeenergization of relay 21 1 and lamp216. Lamp 216 thereupon isextinguished to notify the toll operator at position 13 that the calledparty has responded and that the telephonic connection is completed andin readiness for conversation.

Upon completion of the conversation, the

called subscriber at station A replaces the receiver on the switchhookthereby interrupting the energizing circuit for relay 127 which in turncauses relay 101 to release. Relay'101 in releasing, places a momentaryground on conductor 132 Which momentarily operates relay 100 over anobvious circuit. Relay 100 in operating, again sends out an impulse ofcurrent from the sources 118 119 to cause the operation of relays 20%and 205 and subsequently to relight lamp 216 to notifiy the tolloperator that the conversation has ceased.

The toll operator then removes plug 200 from jacl 201 thereby causingthe deenergization ofreay 218 which in turn causes Before relay 22 1releases, relay 218 Willhave deenergized thereby connecting the 1500cycle and current I goo source to the line conductors 220 and 221ovcrconductors 226 and 22? whereupon current from this source flows outover the line to actuate relay 105. Relay 105 in operating, interruptsat its circuit controlling element 1416, the normal energizing circuitfor relay 1 15. Relay 1 15, in releasing, establishes a circuit for theinitial energization of relay 107 extending from, grounded battery,through the normal contacts 108 of relay 104C, conductor 109, Winding ofrelay 107,

conductor and contacts of relay 1 15 to ground. The response of relay107 and the closure of its forward contacts substitutes ground potentialto establish a self-locking circuit for this relay independent of theground through the contacts of relay 14st). A circuit may now be tracedfrom grounded batter lamp 110, left-hand armature and front contact ofrelay 111 and front contacts of relay 107 to ground. The illumination oflamp indicates to the operator at position C that the conversationhasceased and the connection may be taken down whereupon she removesplug 112 from jack 113. Upon the removal of plug 112 from jack 113,cut-ofi". relay 115 is deenergized thereby placing line relay 1.16across the line A in readiness for a call originating at the station online A. The removal of plug 112 from ack 113 also returns the toll lineapparatus associated therewith to normal. The

release of relay 111 opens the circuit for lamp 110 as traced throughthe front contact and armature of relay 107.

If, prior to the'removal of plugs 200 and 112 from their respectivejacks 201 and 113, and subsequent to the replacement or" the receiver onthe switchhook by the subscriber on line A, the calling subscribershould wish to be reconnected with the subscriber on nne A, the operatorat position 13 will again actuate key 229 and resignal the subscriber online A as hereinbefore described.

- The condenser 150, shown in Fig. 1, is con nected in parallel with thewinding of relay 100 and serves to prolong the impulse conveyed to relay100 whenever relays 101 and 111 are operated. Upon the energization ofrelay 101 or 111, ground is momentarily con-' nected to the Winding ofrelay 100 through conductor 132, whereupon relay 100 energizes for ashort period and condenser 150 charges, so that upon removal of groundfrom conductor 132 to release relay 100 the condenser 150 discharges andsustains the pulse through the winding of relay 100.

The resistance elements 270 and 271, Fig. 2, are utilized to maintainrelays 218, 222 and 224 operated during; the successive operations ofrelays 212, 214 and 210.

It will be clear from the previous description that relay 111 is underthe control of the operator at position C and that relay 107 is underthe control of the operator at position B. With relay 111 deenergizedand relay 107 energized (that is, in their normal conditions) thecircuit for lamp 110 will be open. In case plug 112 should be insertedinto the jack of a line and no plug is inserted into jack 201 at thedistant end of the toll line, the energized condition of relay 111 willcause the illuminationot lamp 110; in a converse manner the insertion ofplug 200 into jack 201 and the resulting release of relay 107 while plug112 is not connected to the line circuit, will also result in thelighting of lamp 110. Lamp 110 lighting in such a manner serves as aguard signal.

During the period of a connection the signal 216 may be flashed in casea party at station A may desire the attention of an operator. Responsesof the relay 127 and in turn the relay 100 to a flashing movement of theswitchhook at station A will result in applications of current from thesources 118 and 119 to the line L to cause the relays 204 and 205 toestablish respective cycles of response and release of the relays 21 1,210 and 212 in such a manner that for each down or disconnect positionthe lamp 216 Will be lighted, while for each up or closed position ofthe switchhook the lamp will be extinguished. v

During periods a connection may beestablished and while the receiver maybe on its. switchhook at the station A, the operator at B may, byremoving and reinsert-ing the plug 200 relative tothe jack 201', causethe lamp 110 to be flashed. This is effected by cycles of release andoperation of the relays 218, 222 and 224: in applying impulsesrespectively from the sources 219 and 228 to alternately energize thedistant relays 105 and 10 1. In response to such flashing, the operatorat C may connect the plug 112 to a supervisors circuit (not shown) whomay receive from the operator at B request for verification as to classof service or any other matter relative to the station or point undercall.

Vfhat is claimed is: y Y I 1. 1n a'telephone system, first and secondswitching points, a line intermediate said points, a telephone station,a line intermediate said second switching point and said station, asignal at said second switching point, sources of alternating currents,means at said switching points for connection with said lines, and meansresponsive to the dis connection of said first means at said first pointfor selectively applying current from said sources to afiect saidsignal.

2. In a telephone system, a first and a second operators position, aline circuit joining said positions, a telephone station and a linetherefor extending to said first position, switching means at saidposition joining said station to said second position, signaling meansat said positions, sources of alternating currents, and means responsiveto an interruption of a connection at either of said positions to applycurrent from one of said sources to affect the signal. at the oppositeposition. i

3. In a telephone system, a line circuit, a first and a second pointjoined by said line, a signal at said first point, a link circuit atsaid second point, sources 05211176? nating currents, and meansresponsive to the I connection of said link circuit to said line andresponsive to the disconnection of said link circuit from said line toselectively apply current from said sources to actuate said signal. g Q

1. In a telephone system, a line circuit, a first and a second operatorsposition joined by said line, a signalat said first position, alinkcircuit atsaid second position, sources of alternating currents, meansresponsive to the connection of said link cir' cuit with said line, andresponsive to the disconnection of said link circuit from said line toselectively apply current from said sources to said line,- and meanscontrolledby said applied current for actuating said signal.

5. In a telephone system, a linecircuit, a first and second operatorsposition joined by said line, a signal at said first operators position,a link circuit at said second operators position, sources of alternatingcurrents, and means responsive to the connection of said link circuitwith said line to selectively apply the current from said sources toactuate said signal.

6. In a telephone system, a line circuit, a first and a second pointjoined by said line, a signal at said first point, sources of current, alink circuit associated with said line, and means responsive to thedisconnection of said link circuit from said line to selectively applycurrent from said sources to actuate said signal.

7. In a telephone system, a line circuit, alirst and a second pointjoined by said line, a signal at said first point, a link circuit atsaid second point, sources of alternating currents, and means responsiveto the connection of said link circuit to said line circuitto connectcurrent from one of said sources to said line to actuate said signal inone manner, and means responsive to the disconnection of said linkcircuit from said line to connect current from another of said sourcesto said line to actuate said signal in another manner.

8. In a telephone system a line circuit, a cord circuit, sources ofalternating currents, switching means for selectively applying saidsources to said line, a signal for said line, means for applying certainof said sources to affect said signal when the cord circuit is joined tothe lines and for applying other of said sources to affect said signalwhen the cord is removed from the line.

9. In a telephone system, a first, second and third point, circuits forinterconnecting said points, switching means at said first and secondpoints for joining certain of said circuits in connecting said thirdpoint with said second point, a signal at said second point, sources ofalternating currents, and means responsive to the interruptions of thejoined circuits at said first point to apply said alternating currentsin affecting the signal at said second point.

10. In a telephone system, a subscribers line, a station thereon, anoperators cord circuit, a supervisory signal for said cord circuit, aline circuit, a signal for said line circuit, sources of alternatingcurrents, means responsive to the connection of said cord circuit tosaid line circuit for connecting one of said sources of current to saidline circuit, means selectively responsive to currents applied toactuate said signal, means to connect said line with said subscribersline, means for applying current to the subscribers line to signal thestation thereon, means controlled by the called station for connectingcertain of said current sources to said line circuit, and meanscontrolled thereby to actuate said supervisory signal.

11. In a telephone system, a subscribers line, a station thereon, anoperators cord circuit, a supervisory signal for said cord circuit, aline circuit, a signal for said line circuit, sources of alternatingcurrents, means responsive to the connection of said cord circuit tosaid line circuit for connecting one of said sources oi current to saidline circuit, means at the distant end of said line selectivelyresponsive to currents applied to actuate said signal, means to connectsaid line With said SllbSCIlbB'IFS line, means for automaticallyapplying ringing current tothe subscribers line to signal the stationthereon, means cont-rolled by the called station for connecting certainof said current sources to said line circuit, and means controlledthereby to actuate said supervisory signal to indicate that the calledparty has disconnected.

In witness whereof, I hereunto Subscribe my name this 7th day ofDecember A. D., 1922.

HENRY l V. ONEILL.

